@@ -222,6 +222,33 @@ matched:
return -1;
}
+static void rsvp_replace(struct tcf_proto *tp, struct rsvp_filter *n, u32 h)
+{
+ struct rsvp_head *head = rtnl_dereference(tp->root);
+ struct rsvp_session *s;
+ struct rsvp_filter __rcu **ins;
+ struct rsvp_filter *pins;
+ unsigned int h1 = h & 0xFF;
+ unsigned int h2 = (h >> 8) & 0xFF;
+
+ for (s = rtnl_dereference(head->ht[h1]); s;
+ s = rtnl_dereference(s->next)) {
+ for (ins = &s->ht[h2], pins = rtnl_dereference(*ins); ;
+ ins = &pins->next, pins = rtnl_dereference(*ins)) {
+ if (pins->handle == h) {
+ RCU_INIT_POINTER(n->next, pins->next);
+ rcu_assign_pointer(*ins, n);
+ return;
+ }
+ }
+ }
+
+ /* Something went wrong if we are trying to replace a non-existant
+ * node. Mind as well halt instead of silently failing.
+ */
+ BUG_ON(1);
+}
+
static unsigned long rsvp_get(struct tcf_proto *tp, u32 handle)
{
struct rsvp_head *head = rtnl_dereference(tp->root);
@@ -454,15 +481,26 @@ static int rsvp_change(struct net *net, struct sk_buff *in_skb,
f = (struct rsvp_filter *)*arg;
if (f) {
/* Node exists: adjust only classid */
+ struct rsvp_filter *n;
if (f->handle != handle && handle)
goto errout2;
+
+ n = kmemdup(f, sizeof(*f), GFP_KERNEL);
+ if (!n) {
+ err = -ENOMEM;
+ goto errout2;
+ }
+
+ tcf_exts_init(&n->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE);
+
if (tb[TCA_RSVP_CLASSID]) {
- f->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]);
- tcf_bind_filter(tp, &f->res, base);
+ n->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]);
+ tcf_bind_filter(tp, &n->res, base);
}
- tcf_exts_change(tp, &f->exts, &e);
+ tcf_exts_change(tp, &n->exts, &e);
+ rsvp_replace(tp, n, handle);
return 0;
}
This completes the cls_rsvp conversion to RCU safe copy, update semantics. As a result all cases of tcf_exts_change occur on empty lists now. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> --- net/sched/cls_rsvp.h | 44 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html